book Maths Puzzle Numerical Ability

Thirty students bought pennants for the football game.Plain pennants cost $4 each and fancy ones cost $8 each.if the total bill was 168 how many students bought the fancy pennants

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x-1+x-2=1-2x
x+3+x-3=3-x this is a fraction,line goes acrossn all 3 im doing "zero and negaive exponents"...
in need to "use the quotient of powers property to simplify the expression."
1. 5^6/5^3



this is one i did, i dont know if its right
ex.
m^5/m^11= 1/m^-6= m^5+m^6/m^11= 1